。
She isn't necessarily completely satisfied.
Literal
She [topic-は] completely satisfied-is [not necessarily-とは限らない].
~とは限らない is a set pattern meaning 'it's not necessarily the case that' — it softly challenges an assumption without fully negating it. This doesn't say she's unsatisfied, only that complete satisfaction shouldn't be assumed. 全く (まったく) means 'completely' here, and the partial negation from とは限らない creates a subtle meaning: she may be partially satisfied, but not necessarily fully so. This is a useful pattern for nuanced, non-absolute statements.